Check the listing for details. Renogy BT-1 Bluetooth Module Solar Charge Controller Wireless Monitor PV System. Condition: Brand New. Listed at 28.62 USD. DESCRIPTIONThe Renogy BT-1 is a great addition to any compatible Renogy solar charge controllers. Powered by its RJ12 communication port, the BT-1 provides wireless monitoring of system data through the Renogy DC Home smart phone App. And allows users to change parameters when using the Renogy DC Home smart phone App. If you have any questions regarding this product, please submit a case! KEY FEATURESWirelessly monitor and control compatible solar charge controllers via Bluetooth.Connects to our user-friendly smart phone App, Renogy DCHome, to keep track of your system.Embedded exclusive Bluetooth chip with high efficiency and low energy consumption.Bluetooth 4.2 and BLE technology provides fast and uninterrupted communication.Powered directly through RJ12 communication port.Signal range up to 82ft.Two LED lights indicate the power and Bluetooth connection condition.